PS-360C Pneumatic Compactor Propel System Caterpillar

Piston Pump Neutral - Test and Adjust

Usage:

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Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine.

To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

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Note: Perform the Relief Valve (Charge) –Test and Adjust before you perform this test.

Note: Perform the following steps before conducting this procedure:

Place the propel lever in NEUTRAL.
Ensure that the machine cannot move. Block the tires with appropriate devices. The machine could also be placed against a loading dock or another object which cannot move, in order to prevent movement.
Engage the parking brake.
Stop the engine.

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Loosen the set screw. Rotate needle valve (1) clockwise until the valve seats. Tighten the set screw.
Note: Needle valve (1) is located in the engine compartment on the right side of the machine.

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Connect Tool B between X1 port (2) and X2 port (3) .
Note: Install the adapter from Tool B in X2 port (3) .

Connect one 0 - 69000 kPa (0 - 10000 psi) pressure sensor from Tool A to forward pressure tap (5). Connect the other 0 - 69000 kPa (0 - 10000 psi) pressure sensor from Tool A to reverse pressure tap (4) on the propel pump.

Start the engine. Operate the engine at 2250 rpm (high idle). Monitor the hydraulic oil temperature with Tool C. Operate the machine until the oil temperature reaches 43° ± 5.6°C (110° ± 10°F).

Compare the pressure readings at forward pressure tap (5) and reverse pressure tap (4). The pressure readings should be equal.
Note: The pressure should be approximately 2500 kPa (360 psi).

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If the pressure is equal, go to Step 8. If the pressure is not equal, loosen the locknut. Adjust the pressure with neutral adjustment screw (6) of the pump. If the pressure at forward pressure tap (5) is greater than the pressure at reverse pressure tap (4), rotate the adjustment screw counterclockwise. If the pressure in the forward pressure tap is less than the pressure in the reverse pressure tap, rotate the adjustment screw clockwise.

Engage the parking brake. Stop the engine. Remove the 0 - 69000 kPa (0 - 10000 psi) pressure sensors from forward pressure tap (5) and remove the sensor from reverse pressure tap (4). Install a 0 - 3500 kPa (0 - 500 psi) pressure sensor in the forward and reverse pressure taps.

Compare the pressure readings at forward pressure tap (5) and reverse pressure tap (4). The pressure readings should be equal. If the pressure is not equal, go to Step 11. If the pressure is equal, go to Step 12.
Note: The pressure should be approximately 2500 kPa (360 psi).

If the pressure is not equal, loosen the locknut. Adjust the pressure with neutral adjustment screw (6). If the pressure at forward pressure tap (5) is greater than the pressure at reverse pressure tap (4), rotate the adjustment screw counterclockwise. If the pressure at the forward pressure tap is less than the pressure in the reverse pressure tap, rotate the adjustment screw clockwise. Repeat Step 10.

Stop the engine. Remove Tool A and Tool B. Loosen the set screw on needle valve (1). Rotate needle valve (1) counterclockwise until the valve stops. Tighten the set screw.